Skip to main content

SECOND TERM, SS1 WEEK 4 (FUNCTIONING ECOSYSTEM)

 

FUNCTIONING ECOSYSTEM 



  1. Roles of Autotrophs, Heterotrophs, and Decomposers

    • Autotrophs (Producers): Organisms (e.g., plants, algae) that produce their own food using sunlight (photosynthesis) or chemicals (chemosynthesis).
    • Heterotrophs (Consumers): Organisms that obtain energy by consuming other organisms (e.g., herbivores, carnivores, omnivores).
    • Decomposers: Organisms (e.g., fungi, bacteria) that break down dead organisms, recycling nutrients into the ecosystem.

  2. Trophic Level

    • Represents a feeding position in a food chain/web.
    • Levels: Producers → Primary Consumers → Secondary Consumers → Tertiary Consumers → Decomposers.

  3. Food Chain and Food Webs

    • Food Chain: A linear sequence of organisms through which energy flows. Example: Grass → Grasshopper → Frog → Snake → Hawk.

    • Food Web: A complex network of interconnected food chains showing multiple feeding relationships.

  4. Energy Flow Along Trophic Levels (Ecological Pyramids)

    • Pyramid of Numbers: Shows the population size at each trophic level (usually largest at the base).

    • Pyramid of Energy: Represents energy loss at each level (only 10% of energy is passed on; 90% lost as heat). 

    • Pyramid of Biomass: Illustrates the total mass of organisms at each trophic level, decreasing upwards. 
    • Assignment 
    1. Define trophic level and explain its importance.
    2. Differentiate between a food chain and a food web

Comments

Post a Comment

Popular posts from this blog

WAEC 2025: BIOLOGY PRATICAL MADE EASY

   WAEC CHIEF EXAMINATION REPORT WASSCE MAY/JUNE BIOLOGY PRACTICAL SOLUTIONS AND GUIDES SPECIMENS NAMES     A BEAN WEEVIL         B  BEAN SEED WITH HOLE        C WHOLE WATERLEAF PLANT .       D QUILL FEATHER .        E LONGITUDINAL SECTION OF PINEAPPLE FRUIT         F ORANGE FRUIT (Transverse section)         G RAW EGG OF A DOMESTIC FOWL .       H TEST TUBE CONTAINING 3ML OF WATER      J LONGITUDINAL SECTION OF BOILED EGG POSSIBLE QUESTIONS ON SPECIMEN A Zoological Classification: Taxonomic Rank Classification Kingdom Animalia Phylum Arthropoda Class Insecta                                       Sourced 9/05/2025: wikipedia Identify specimen A.  Answer: ...
5 comments
Read more

WEEK 1: SS1 SECOND TERM BIOLOGY

WEEK 1: TOPIC: BASIC ECOLOGICAL CONCEPTS CONTENT ·         Definition and Branches of Ecology ·         Ecological Terms (Environment, Biosphere, Habitat, Ecological Niche, Population, Community, Ecological System, Biome) ·         Components of an Ecosystem   BASIC ECOLOGICAL CONCEPTS DEFINITION OF ECOLOGY Ecology is the study of plant and animals (as well as microorganism) in relation to their environment. As a practical science, ecological studies involve:- ·         Studying the distribution of living organisms ·         Finding out how living organisms depend on themselves and their non-living environment for survival. ·         Measuring factors affecting the environment.   BRANCHES OF ECOLOGY Depending on whether the organisms are studied alone or in groups, ecolo...
Post a Comment
Read more

SS2 WEEK 1: BIOLOGY ALIMENTARY CANAL

 Lesson Objectives By the end of the lesson, students should be able to:   1.        Define the alimentary canal and identify its components. 2.        Explain the digestive system and processes in invertebrates. 3.        Describe the digestive system and processes in vertebrates. 4.        Compare the digestive systems of invertebrates and vertebrates.   What happens to the food we eat? Do animals digest food the same way humans do? Definition of Key Terms: 1.        Alimentary Canal: A long, continuous tube that starts from the mouth and ends at the anus, where digestion and absorption occur. 2.        Digestive System: The organs and structures involved in breaking down food into nutrients the body can absorb.   Invertebrates: Animals without a backbone (e.g., earthworms, insects). Vert...
Post a Comment
Read more